Which statement is true about mass and weight overall?

• A. Mass remains constant across gravity changes; weight changes with gravity
• B. Weight remains constant across gravity changes; mass changes with gravity
• C. Both mass and weight change with gravity
• D. Neither mass nor weight changes with gravity

Answer: (A)

Mass measures how much matter an object has and doesn’t depend on where you are or how strong gravity is. Weight, on the other hand, is the force of gravity acting on that mass, so it changes with the local gravitational acceleration. The relationship is weight equals mass times gravity (F = m × g). Because mass is intrinsic to the object, it stays the same when you move from Earth to a place with different gravity, but weight scales with the gravity there. For example, a 70 kg mass weighs about 686 N on Earth (70 × 9.81), but only about 113 N on the Moon (70 × 1.62). This shows that the same object has the same mass in different gravity environments while its weight varies. So the true statement is that mass remains constant across gravity changes, and weight changes with gravity.